On Sun, May 09, 2021 at 02:53:09PM +0200, Sebastian Pipping wrote:
> The related soversions are:
> 
>   2.2. 9 = 7:11:6 -> libexpatso.1.6.11 (GUIX today)
>   2.2.10 = 7:12:6 -> libexpatso.1.6.12
>   2.3. 0 = 8: 0:7 -> libexpatso.1.7.0 (GUIX W.I.P.)
>   2.4. 0 = 9: 0:8 -> libexpatso.1.8.0 (upcoming)

Alright, in this case we'll need to cherry-pick the relevant bug fixes.

See the manual section Security Updates for this note:

"Other restrictions may apply: for instance, when adding a graft to a
package providing a shared library, the original shared library and its
replacement must have the same SONAME and be binary-compatible."